Stock-feeding device for screw-machines



(No Model.) 3 Sheets-Sheet '1.

AJ. HARTNBS'S; STOCK PEEDING DEVICE PCR SCREW MACHINES.

Patented Nov. 25, 1890.

3 Sheets-Sheet 2.

(No Model.)

J. HARTNBSS.

STOCK PEBDING BB1/71GB FCR SCREW MACHINES.

No. 441,411. Patented. Nov. 25, 1890.

INVEMTDR fue "cams versus cu.. moro-Lamo., wAsumnrnu, u. c.

(N Model.)

' v 3 Sheets-fShet 3. J. HARTNBSS. STOCK FEBDING DEVICE FOR SCREWMACHINES.

No. 441,411. Patented Nov. 25, 1890.

MTM-:S555:

' l INVENTDR:

'lathe accompanying drawings, forming a n "ing and operating devicesembodyingV my im- 'prcvementsthe front plate of said head being vremovedto show more Aclearly the internal parts. jFigxQ represents a section onlineI -'PATEENT FFICE.

` JAMES IIR'INESS, yOF SPRINGFIELD, VERMONT.

STOCK-FEEDING DEVICE FOR SCREW-MACHINS.

SPECIFICATION forming part of Letters Patent No. 441,411, dated November25, 1890. A' "Apparition mea August 1s, 1890. serinrassasll. (No mode.)p,

To @ZZ whom t may concern:

Beit known that I,JAMES HARTNESS, of Springfield, in the county of'Windsor and :Mechanism for ScreW-lVIachines, of which the following isaspecification.

for feeding tated Aon their own axes while revolving, 'as

shownin Letters Patent of the United States: i5 n bld-,425,372 of dateApril S, 1890.

p art ofthis specification, Figure l'represents `a frontend elevation ofthe rotary head, the' y'feedlrolls therein, and the feed-roll support-`2 2, Fig. l. Fig. S'represents a section'on line 33, Fig. 1. Fig.represents a section on line i 4,' Fig. 2. Fig. 5 represents a sectiononline 5 5, Fig.' 4. Fig, 6 represents aside view of the, annularworm'or scroll, hereinafter referredtd he same letters l same parts inall the figures.

Infthe drawings, a represents'a head or holder, whichmay be affixed ytotheI tubular" 'spindle l2 of a lathe by any suitablemeans.

'i Vd @represent the feed-rollsV whi'ch'feed the stock, or, inotherwords, the rod orwire from c whichscrews or other'like articles are madeby the mechanisnrwith which the machine to g which my improved feedingdevices are applied is provided; The shafts e e, to which' The inventionhas for its object, first, to' provide simple, strong,`and eifectivemeans?` for supporting'the feed-rollswithin the rotating head whichycontainsv them; secondly,"t o Yprovide'improved means for simultaneouslyrotating said rolls' while they are I revolvingA about theaXis ofthehead, and, thirdly,1togi f provideimproved' means for adjusting` 'tlie,rolls tothe sizeof the said bars, 1 ods,'orwi`res`. f To; theseendsjtheinvention consists in the improvements whichA I will now proceed toi-describe and claim. I"

of reference indicate the f said feed-rolls are attached, are journaledin blocks ff', which are adapted to slide on suitable guides or waysinthe head a, the movement of said blocks being such that the feedirolls, which are arranged at opposite sides of the axial center of thehead, can move radially, and thus approach and recede from 'each otherto accommodate stock of any diameter within the capacity of the machine.

g represents a scroll or worm, which is a ring tted to rotate on theexterior of the neck a of thehead, said ring being provided onone sidewith teeth g', which are cnt tangentially, each tooth being a tangent ofa circle of lesser diameter than the interior of the ring, as shown inFig. 6. 157th represent right and left hand Worms,

which are rigidly connected, and i represents a1 worin wheel or gear,which is located be tween saidworms and is rigidly connected therewith,said worms and Wheels being here shown as all formed in one piece andadapted to .rotate on'` a stud or bearing j, affixed to the head' a.'lThe said worm-wheel t' has its teeth formed to engage'the tangentialteeth g of the scroll or' worm g, while the right and left worms 71. 7L'engage corresponding wo rin-wheels 7c 7s, aflixed to the shafts of thefeed-rolls. The

said worm-gear i, worms h h, and worm-gears 7o k'constitute connectionsbetween the feedroll shafts and the annular worm or scroll g, wherebythe feed-roll shafts may be simul- `taneously rotated in oppositedirections when the head a is rotated and the annular worm or scroll isheld stationary, the worm or scroll when thus held causing the gear l1Jand Worms h h tov rotate on their common axis while they are beingrevolved about the center of the head by the rotation of the latter,while the worms impart rotary motion to the feed-roll shafts, eachfeed-roll being thus given aplanetary motion-viz., a revolution aboutthe center of the head by the rotation of the latterand a rotarymovement on its `own axis by the described connection with the annularworm or scroll. It will also be seen that the connection between theannular worm or scroll and the feed-roll shafts is equally oper- Aativeunder all adjustments of the feed-rolls,

IOO

sothat the rolls are rotated in the manner dei scribed in'any of thepositions to which they may be adjusted.

Vlien the annular Worm or scroll is left loose or idle and permitted torotate with-the head, there will be no independent rotation ot' thefeed-rolls, and they will simply revolve idly about the center of thehead without feeding the stock.

The annular Worin may be made operative to cause the above-describedrotation of the feed-rolls in any suitable Way. For example, it may beprevented from rotating when it is desired to cause the feed-rolls tooperate by means of a friction band or brake applied to the periphery ofthe ring Whichcompe'ses the annular Worm in the saine manner that theloose gear fm (shown in my patent above referred to) is held to operatethe feed-rolls lshown in that patent. I have not illustrated saidV bandand lthe devices that operate it in the .present case, becausev theapplication of the 'devices shown in my former 'patent to the annularWorin g will be perfectly obvious.A M-y invention is not limited,however, to the friction-band as the means for holding the annular yWormg -nor to a normally-loose Worm and devices for holding the saine tomake it inoperative. The same result may be pro-v duced by continuouslyor permanently holding the 'annular Worm so 'that vit. cannot 'ro-j tateand moving the 'same laterallyinto and out of engagement with theWorm-,gear i to make it operative and in pe`1`rative.

I do not limit myself to the devices here shown for imparting rotarymotion to the feed-rolls While 'they are revolving about the center ofthe chuck, but may use any other suitable means adapted to operate theradi- 4ally-'adjustable feed-rolls in any of the posi-Y tions 'to whichthey may be adjusted, the feay ture of my invention toWh-ich I attachthel most importance being the feed-rollsand the feed-roll'carrying-blocks 'adjustable radially on guides orways inthe rotaryhead.

For yadjustin-g the feed-rolls to the 'dia'me-'g ter of 'the stock havehere shown 'a bolt o, which is 'screv'v-tl'i'readedV at one end and enfgaged atits 'screw-'threaded portion with the blockf. The unthreadedportion of the bolt: passes through the 'other block f', l'an'd'isprovided jw'it'h a slotted head o', which permits vthe bolt to be turnedrby `a suitable tool. A

spring 29in'terposed between fthe head yot' the bolt and the bottom ofan enlargement of fthe socket in the block f', presses `said blockagainst the ends of a pin @which is 'inserted -i'n the -loolt o betweenthe blocks. 'lfhe lrota-l tion Aof :the bolt in one direction causes itto increase the distance between the'block's and feed-rolls, While arotation of said bolt in the opposite direction decreases the distanceb'e-g twee-n the blocks 4and feed-rolls. y

The feed-rolls [d d do not act to center 'the g 'stock Yin 'the head,the stock being held cen-- tral by a centering-bushing u, which lis removably inserted in the 'face-plate @of the head d, and has an oriiiceformed fto closelyl fit thestock, said orifice being at the axial,ycenter of the head. The bushing u, may be*y assisted, when heavy stockis used, bythe centering-screws c c` in the neck of the head a. Aseparate bushing is employed for each size of stock, the bushing beingexternally screwthreaded and screwed into an internallythreaded openingin the face-plate er.

The feed-rolls and their support-ing-blocks are loosely mounted in thehead and conform to the position in which the stock is held by thecentering devices.

I claiml.` The combination of a rotary head or helder, a plurality loffeed-rolls within the same arranged to bear simultaneously on the/stock, which occupies the axial center of the head, blocks adapted toslide radially in the.y head and supporting the .shafts of thefeedrolls, and means for simultaneously rotating said rolls, as setforth.

2. The combination of a lrot-ary head or holder, a normally-.looseannular Worm or scroll concentric with the axis of the head, `aplurality of feed-rolls in the lhead arranged to bear simultaneously onthe stock, blocks adapted to slide radi-ally in the'head 'and supportingthe 'feed-roll shafts, and connections between the said feed-rolls'haftsand annular Worm, whereby said rolls may be simultaneously rotated, asset forth.

3. The combination `ot" the rotary head or holder, a plurality offeed-rolls Within the same 'arranged to bear simultaneously 'on thestock, which occupies the Vaxial 'center of 'the head, blocks adapted toslide Vradially in the head and supporting the shafts of the Ifeedrolls,and 'adjusting devices whereby said blocks maybe moved toward or fromeach other to decrease or increase the distance between the feed-rolls,as set forth.

4. lThe combination ot' a rotary head or holder, a normally-looseannular Worm or scroll concentric With the axis of 'the head,-a

plurality of feedrolls in the head arranged to bear simultaneously lonthe stock, blocks adapted to slide radiallyv in 'the head .andsupporting the feed-roll shafts, the Worm-gear, and right and left`gears 4connected 'to rotate together in said head, saidWorm-gear-mesh'- ing with the annular `Worm or scroll, and theworm-gears onf'the feed-roll shafts meshing with the said right and leftWorms, asset for-th.

5. The combination of a rotary head or holder, a normally-loose annularWorm or scroll concentric with Vthe axis of 'the'head,a plurality offeed-rolls in the head arranged to bear simultaneously on the stock,blocks adapted to slide radial-lyin the head and supporting thefeed-roll shafts, the Worm-gear,

and right and 'left gears connected to rotate together in said head,said worm-,gear meshing with the annular worm or scroll, the Worin-gearson theffeed-roll shafts meshing with the said rightandleft'worm's,wandvdevices IOO for 'adjusting saidblocks to varythedistance p 'between the vfeed-rolls, as set forth.

6. The combination of the rotary head, the

blocks adapted to slide radially in said` head, the shafts journaled insaid blocks, the feedrolls attached to the shafts, means forsimultaneously rotating said shafts and rolls, and

5 the block-adjusting devices comprising the headed bolt having` ascrew-thread connection with one block and a loose connection with theother, one or more projections on said bolt between the blocks, and aspring in- Io terposed between the head of the bolt and the blockadjacent to said head, as set fort-h.

'7. The combination of the rotary head, the blocks adapted to slideradially in the head and loosely mounted therein, the shafts jour# July,A. D. 1890.

JAMES HARTNESS.

lVitnesses E. R. FELLoWs, T. CHYNOWETH.

